Cisco Firepower Management Center Software Authenticated Directory Traversal Vulnerability
A vulnerability in the web-based management interface of Cisco Firepower Management Center (FMC) Software could allow an authenticated, remote attacker to perform a directory traversal attack on an affected device. The attacker would require valid device credentials. The vulnerability is due to insufficient input validation of the HTTPS URL by the web-based management interface. An attacker could exploit this vulnerability by sending a crafted HTTPS request that contains directory traversal character sequences to an affected device. A successful exploit could allow the attacker to read or write arbitrary files on the device.
- Published
- Oct 27, 2021
- Updated
- Aug 11, 2026
- EPSS
- 2.0% · 80th percentile
- CWE
- CWE-26
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Report tools
Action score
33
Monitor
Low priority for now.
- CVSS
- 32 / 40 · 8.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.0%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 8.1
- CNA · cisco
- 8.1
- agree
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| cisco | firepower management center virtual appliance | cpe:2.3:a:cisco:firepower_management_center_virtual_appliance |
| cisco | secure firewall threat defense | cpe:2.3:a:cisco:secure_firewall_threat_defense |
| cisco | sourcefire defense center | cpe:2.3:a:cisco:sourcefire_defense_center |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- cisco firepower management center virtual appliance6.2.3
- cisco firepower management center virtual appliance6.4.0
- cisco firepower management center virtual appliance6.5.0
- cisco firepower management center virtual appliance6.6.1
- cisco firepower management center virtual appliance6.6.2
- cisco firepower management center virtual appliance6.6.3
- cisco firepower management center virtual appliance6.6.4
- cisco firepower management center virtual appliance6.7.0
- cisco firepower management center virtual appliance7.0.0
- cisco firepower management center virtual appliance7.1.0
- cisco secure firewall threat defensebefore 6.4.0.13
- cisco secure firewall threat defense6.5.0 and later · before 6.6.5
- cisco secure firewall threat defense6.7.0 and later · before 6.7.0.3
- cisco secure firewall threat defense7.0.0 and later · before 7.0.1
- cisco sourcefire defense center6.2.3
- cisco sourcefire defense center6.4.0
- cisco sourcefire defense center6.5.0
- cisco sourcefire defense center6.6.1
- cisco sourcefire defense center6.6.2
- cisco sourcefire defense center6.6.3
Versions reported by the vendor
Affected version ranges reported by the assigning authority (cisco). Independent of NVD's CPE analysis and usually ahead of it.
Cisco Cisco Firepower Management Center
- n/aaffected
Same product
cisco: all recordsOther highest-scoring records for the same primary product.
- CVE-2021-34756Cisco Firepower Threat Defense Software Command Injection Vulnerabilities31Monitor
- CVE-2021-34755Cisco Firepower Threat Defense Software Command Injection Vulnerabilities31Monitor
- CVE-2021-34781Cisco Firepower Threat Defense Software SSH Connections Denial of Service Vulnerability30Monitor
- CVE-2021-34764Cisco Firepower Management Center Software Cross-Site Scripting and Open Redirect Vulnerabilities24Monitor
- CVE-2021-34761Cisco Firepower Threat Defense Software CLI Arbitrary File Write Vulnerability24Monitor
- CVE-2021-34763Cisco Firepower Management Center Software Cross-Site Scripting and Open Redirect Vulnerabilities19Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
No fix version is recorded for this entry. Check the references for vendor advisories.
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-21-0876 · Oct 28, 2021(Cisco Güvenlik Zafiyeti)
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- none
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- None
Weakness class (CWE)
CWE-26 · Path Traversal: '/dir/../filename'CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.